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Considering the symptoms, this can be due to possibility of a thrombosed vein (piles)
This can cause painless lump in anal region
It should be examined by doctor.
You may avoid straining at stool and take a stool softener .
Ideally, you should not ignore and consult doctor, for rectal examination.
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No, this doesnot looks to be cancer. To make a diagnose, you should visit doctor .
Proper management will be advised. This does not seems to be occurring due to serious disease.
I wish for your good health.
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